In the 19th Tom Thorne book, our detective shows no signs of flagging, even with a trying case. Four police officers have been murdered, and rather than the exception, they’re the rule – as someone is intent of meting out vengeance against law and order. Is it the work of someone with a bone to pick, or to measure out a permanent form of revenge for unspeakable acts? As Thorne and his partner Nicola Tanner dig deep, what they discover is far from palatable. It becomes clear that there’s few you can trust… I haven’t read all of the Thorne books, but there are similarities to Mark’s other character, Declan Miller, and both are series that will draw you in and keep you there.